There is, and there is a full tutorial for it as well. I've bought the plug-in myself, adn found it to be very usfull for other things too. And it's cheap! Just watch out for how high you set your settings! It can be very easy to bring your computer to it's knees if you try to set too large an area as grass! lol! Try setting up a couple of different types of patches of grass, then by duplicating as an instance you can put together a varied lawn that won't have to use as much memory. Good luck!